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Tristate switching with microcontroller..

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cse_hammad.611

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problem is that i have a circuit and its loop is controlled by output signal of 8051,,so that loop is completed and circuit is activated,, i have used transistor for tristate switching but it is not working properly.. any suggestion for tristate switching controlled by 8051,,,,??????? thanks
 

HI

If you want to put micro pin in tristate - make it an input pin (it is not a true tristate but it is very closed since with most micro's digital pin input resistance is high)

All the best

Bobi


The microcontroller specialist
 

i have used transistor for tristate switching but it is not working properly.. any suggestion for tristate switching controlled by 8051

Tri-state control can’t be done with one transistor and one microcontroller pin ..
You need two transistors: one to source current from Vcc, and one to sink current to GND ..
When both transistors are off you have “third” state – high impedance ..
And two transistors means two microcontroller pins ..

IanP
:|
 

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